Numerical Simulation Of Response And Damage Analysis On Reinforced Concrete Beams Subjected To Blast Loading

The topic on dynamic response and failure modes of reinforced concrete components as beams and plates subjected to explosion load is of great significance for structural antiknock dynamics research, contributing to engineering application as well. The reinforced concrete beam under explosion load is taken as research object in this paper, the dynamic response of which on the elastic support condition and the influence factors of whose failure modes are both investigated on. The main contents are as follows:1. Numerical simulation of blast wave propagating in free air is carried out by employing software LS-DYNA,and the results are compared with that of empirical formula to verify the applicability of the numerical method used in this paper. The positive and regular oblique reflection of blast wave on the rigid wall, formation mechanism of Mach reflection and propagation of reflected blast wave in the air are all study on by numerical simulation.2. The vibration mode of the elastic supported beam subjected to uniform load is deduced.With a few certain assumptions, the motion balance equation of the beam is solved by applying the second kind of Lagrange equations.3. To explore an available and effective numerical method of dynamic analysis on the reinforced concrete beam subjected to blast, numerical tests are carried out by LS-DYNA according to corresponding blast explosion experiments with results compared.4. Based on the research above, the various factors influencing the failure modes of reinforced concrete beams is investigated on by numerical method, including blast loading rate, strain rate effect on reinforcement and concrete, high-span ratio.